| Year | Count |
|---|---|
| 1960 | 10 |
| 1976 | 5 |
| 1977 | 5 |
| 1978 | 11 |
| 1979 | 8 |
| 1982 | 15 |
| 1984 | 12 |
| 1985 | 25 |
| 1986 | 5 |
| 1987 | 12 |
| 1988 | 14 |
| 1989 | 14 |
| 1990 | 20 |
| 1991 | 19 |
| 1992 | 7 |
| 1993 | 13 |
| 1994 | 7 |
| 1995 | 6 |
| 1996 | 9 |
| 1997 | 35 |
| 1998 | 7 |
| 2000 | 11 |
| 2001 | 24 |
| 2003 | 7 |
| 2004 | 12 |
| 2005 | 10 |
| 2006 | 16 |
| 2007 | 10 |
| 2007 | 7 |
| 2009 | 24 |
| 2010 | 5 |
| 2010 | 6 |
| 2011 | 26 |
| 2012 | 25 |
| 2012 | 28 |
| 2014 | 32 |
| 2014 | 19 |
| 2015 | 308 |
| 2015 | 67 |
| 2016 | 111 |
| 2016 | 37 |
| 2017 | 70 |
| 2017 | 47 |
| 2018 | 77 |
| 2018 | 40 |
| 2019 | 77 |
| 2019 | 33 |
| 2020 | 54 |
| 2020 | 23 |
| 2021 | 30 |
| 2021 | 5 |
| 2022 | 44 |
| 2022 | 18 |
| 2023 | 31 |
| 2024 | 34 |
| 2024 | 10 |